Inclusions: Pure Gypsum crystals usually consist of inclusions, which might be foreign minerals or resources trapped in the crystal composition for the duration of formation. Typical inclusions in gypsum is often clay minerals, iron oxides that cause coloration, and even very small fuel bubbles. Gypsum is probably the oldest and https://www.propanraya.com/id/produk/eco-gypsum-ee-4050